FIX #736: Detector does not draw rects for images with small resolutions

iovodov

2018-05-03 92b25a72006a77073ee99dc69557ce0cde01cc3c

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classes= 20
train  = data/train_voc.txt
valid  = data/2007_test.txt
#difficult = data/difficult_2007_test.txt
names = data/voc.names
backup = backup/